Objective: The objective of this study was to evaluate the peritoneal tissue attachment (adhesion) characteristics and histological properties associated with a novel, fully-absorbable, poly-4-hydroxybutyrate/absorbable barrier composite mesh (Phasix™ ST), compared to a partially-absorbable, polypropylene/absorbable barrier composite mesh (Ventralight™ ST) in both small and large animal models.

Methods: In the small animal model, a single mesh (2x2cm) was unilaterally implanted within the intraperitoneal position via open surgical approach in 10 male, Sprague-Dawley rats (n=5 animals/mesh type), and evaluated at 2 weeks. In the large animal model, meshes (10x15cm ellipse) were bilaterally implanted via laparoscopic surgical approach in 8 female, Yorkshire pigs (n=4 animals/mesh type), and evaluated at 4 weeks. A single mesh type was implanted in a given animal, with meshes placed on either side of the midline. The percent mesh area covered by peritoneal tissue attachments (adhesions), attachment severity, and histological properties were recorded. Semi-quantitative scores were analyzed via non-parametric, Mann-Whitney test and presented as median ± interquartile range. Mesh area covered by peritoneal tissue attachments (adhesions) was analyzed via unpaired, two-tailed t-test and presented as mean ± standard deviation.

Results: As shown in the table below, Phasix™ ST and Ventralight™ ST meshes displayed a similar host response in both small and large animal models, with no significant differences detected between mesh types (p>0.05 in all cases). Generally, both mesh types were associated with minimal, low severity peritoneal tissue attachments (adhesions), mild/moderate inflammation, mild collagen deposition, and mild neovascularization in both small and large animal models. Although not statistically significant, a trend toward lower percent mesh area covered by peritoneal tissue attachments (adhesions) was observed for Phasix™ ST.

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